[X] My Assistant

[edstrick]

The currently posted Spirit Pancam panoramas being taken at Larry's Lookout so far have only L1 (infrared) and L5 (red) filter bands (plus R2 and R7). If band L7 (violet-UV) have been taken, they apparently have not been downlinked yet.

With only 2 spectral channels, it's impossible to get true-color images, but cosmetically acceptible images can be generated by averaging the long wavelength band (L2) and the short wavelength band (L5, in this case) as a "pseudo-middle-wavelength" band. Then generate a color image using L1, Average, L5 as Red, Green, Blue bands, respectively.

In Photoshop 4.0 (menus will vary with other editions and you can't do it with Photoshop-Eviscerated .... I mean Photoshop-Elements.... a shorthand for the image processing/generation sequence is as follows. Note: I'll shorten the input image names to "L2"and "L5", and leave out all the more or less obvious "OK" responses and the like.

File > Open > "L2"
File > Open > "L5"

Window > Tile
Image > Mode > Grayscale
(select/click on the other image)
Image > Mode >Grayscale
(JPL's raw jpgs are RGB, even though there is no color data)

Image > Calculations
Source 1 > "L2"
Source 2 > "L5"
Blending > Normal"
Opacity > 50%
Result > NEW

Image > Mode > Grayscale

Window > Show > Channels (if that tool isn't already onscreen)
">" (click on the right-arrow to get the channel menu)
Merge Channels
RGB Color

Red: "L2"
Green: "Untitled-1"
Blue: "L5"

File > Save
For the filename, I pick the shortwavelength file's name, and append the filter numbers: band2filename_25.jpg

I'll often Image > Adjust >Levels or Image > Adjust > Curves to get better brightness distributions, run Filter > Sharpen > Sharpen to crisp up the image, and, and on screwball filter combinations like these, I may boost color saturation
with Image > Adjust > Hue/Saturation before saving the file.

Attached thumbnail(s)

 

[edstrick]

Attached to the previous post is a 2-color image looking approximately southeast up Husband Hill from Larry's Lookout. The image color and contrasts have been optimized to show the range of color variety in the data, not to approximate "true-color" from the IR and Red bands. The sky appears blue because it is *LESS RED* than anything else in the image.

Attached to this posting is a 2-color view of rocks with what I'm calling "Popcorn" weathering next to the rover.

Attached thumbnail(s)